1 /* 2 * Copyright (c) 2000-2001 Christoph Hellwig. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions, and the following disclaimer, 10 * without modification. 11 * 2. The name of the author may not be used to endorse or promote products 12 * derived from this software without specific prior written permission. 13 * 14 * Alternatively, this software may be distributed under the terms of the 15 * GNU General Public License ("GPL"). 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 21 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 */ 30 #ifndef _VXFS_OLT_H_ 31 #define _VXFS_OLT_H_ 32 33 /* 34 * Veritas filesystem driver - Object Location Table data structures. 35 * 36 * This file contains definitions for the Object Location Table used 37 * by the Veritas Filesystem version 2 and newer. 38 */ 39 40 41 /* 42 * OLT magic number (vxfs_olt->olt_magic). 43 */ 44 #define VXFS_OLT_MAGIC 0xa504FCF5 45 46 /* 47 * VxFS OLT entry types. 48 */ 49 enum { 50 VXFS_OLT_FREE = 1, 51 VXFS_OLT_FSHEAD = 2, 52 VXFS_OLT_CUT = 3, 53 VXFS_OLT_ILIST = 4, 54 VXFS_OLT_DEV = 5, 55 VXFS_OLT_SB = 6 56 }; 57 58 /* 59 * VxFS OLT header. 60 * 61 * The Object Location Table header is placed at the beginning of each 62 * OLT extent. It is used to fing certain filesystem-wide metadata, e.g. 63 * the initial inode list, the fileset header or the device configuration. 64 */ 65 struct vxfs_olt { 66 __fs32 olt_magic; /* magic number */ 67 __fs32 olt_size; /* size of this entry */ 68 __fs32 olt_checksum; /* checksum of extent */ 69 __u32 __unused1; /* ??? */ 70 __fs32 olt_mtime; /* time of last mod. (sec) */ 71 __fs32 olt_mutime; /* time of last mod. (usec) */ 72 __fs32 olt_totfree; /* free space in OLT extent */ 73 __fs32 olt_extents[2]; /* addr of this extent, replica */ 74 __fs32 olt_esize; /* size of this extent */ 75 __fs32 olt_next[2]; /* addr of next extent, replica */ 76 __fs32 olt_nsize; /* size of next extent */ 77 __u32 __unused2; /* align to 8 byte boundary */ 78 }; 79 80 /* 81 * VxFS common OLT entry (on disk). 82 */ 83 struct vxfs_oltcommon { 84 __fs32 olt_type; /* type of this record */ 85 __fs32 olt_size; /* size of this record */ 86 }; 87 88 /* 89 * VxFS free OLT entry (on disk). 90 */ 91 struct vxfs_oltfree { 92 __fs32 olt_type; /* type of this record */ 93 __fs32 olt_fsize; /* size of this free record */ 94 }; 95 96 /* 97 * VxFS initial-inode list (on disk). 98 */ 99 struct vxfs_oltilist { 100 __fs32 olt_type; /* type of this record */ 101 __fs32 olt_size; /* size of this record */ 102 __fs32 olt_iext[2]; /* initial inode list, replica */ 103 }; 104 105 /* 106 * Current Usage Table 107 */ 108 struct vxfs_oltcut { 109 __fs32 olt_type; /* type of this record */ 110 __fs32 olt_size; /* size of this record */ 111 __fs32 olt_cutino; /* inode of current usage table */ 112 __u8 __pad; /* unused, 8 byte align */ 113 }; 114 115 /* 116 * Inodes containing Superblock, Intent log and OLTs 117 */ 118 struct vxfs_oltsb { 119 __fs32 olt_type; /* type of this record */ 120 __fs32 olt_size; /* size of this record */ 121 __fs32 olt_sbino; /* inode of superblock file */ 122 __u32 __unused1; /* ??? */ 123 __fs32 olt_logino[2]; /* inode of log file,replica */ 124 __fs32 olt_oltino[2]; /* inode of OLT, replica */ 125 }; 126 127 /* 128 * Inode containing device configuration + it's replica 129 */ 130 struct vxfs_oltdev { 131 __fs32 olt_type; /* type of this record */ 132 __fs32 olt_size; /* size of this record */ 133 __fs32 olt_devino[2]; /* inode of device config files */ 134 }; 135 136 /* 137 * Fileset header 138 */ 139 struct vxfs_oltfshead { 140 __fs32 olt_type; /* type number */ 141 __fs32 olt_size; /* size of this record */ 142 __fs32 olt_fsino[2]; /* inodes of fileset header */ 143 }; 144 145 #endif /* _VXFS_OLT_H_ */ 146